how protecting full bridge inverter against short circuit

[zizi110]

Hi friends,
i have a full bridge dc-ac converter that is drived with a driver like HIP2100 .
i put R-L load at the full bridge output, but i don't know why suddenly load was short circuit and the high side driver get damaged.
how can i protect full bridge and driver against short circuit?


thanks

 

[FvM]

An inverter with output inductors can be usually protected against load shorts with an output overcurrent sense and fast driver deactivation, considering limited dI/dt.

Internal shorts or load shorts without di/dt limiting inductor are difficult to handle. Best chances are with desaturation detection in gate driver and immediate shutdown. It can work with IGBT and high voltage MOSFET.

 

[zizi110]

Hi FvM,
thanks for your reply
but in this case this idea does not work !
i connect 100 ohm resistor series with 5 mH inductance at inverter output, but when i connect dc supply the smoke comes up from load and i heard a tik tik sound from power supply ( i think that was for overcurrent through the load that was short circuit) :thinker:
maybe power rating of resistor and inductor is low! i dont know .... i used 1/4 w element and dc power supply is 24v.
unfortunately hip2100 does not have any overcurrent protection or desaturation , that is why i select FSBS15CH60 module that has gate driver + 3 leg IGBT and optocoupler-less feature. it has overcurrent protection just for low-side IGBT , and i realy worry about high-side IGBTs.

 

[bilal_sheikh]

can u post the schematic of ur inverter ? i am not able to run the full h-bridge inverter.
the schematic which i am following is as follows